‘Nobody has a monopoly on making mistakes.” When I was Israel’s ambassador to the United States from 2009 to the end of 2013, that was my standard response to reporters asking who bore the greatest responsibility—President Barack Obama or Prime Minister Benjamin Netanyahu—for the crisis in U.S.-Israel relations.

I never felt like I was lying when I said it. But, in truth, while neither leader monopolized mistakes, only one leader made them deliberately.

Israel blundered in how it announced the expansion of Jewish neighborhoods and communities in Jerusalem over the border lines that existed before the Six Day War in 1967. On two occasions, the news came out during Mr. Netanyahu’s meetings with Vice President Joe Biden. A solid friend of Israel, Mr. Biden understandably took offense. Even when the White House stood by Israel, blocking hostile resolutions in the United Nations, settlement expansion often continued.

In a May 2012 Oval Office meeting, Mr. Netanyahu purportedly “lectured” Obama about the peace process. Later that year, he was reported to be backing Republican contender Mitt Romney in the presidential elections. This spring, the prime minister criticized Mr. Obama’s Iran policy before a joint meeting of Congress that was arranged without even informing the president.

Yet many of Israel’s bungles were not committed by Mr. Netanyahu personally. In both episodes with Mr. Biden, for example, the announcements were issued by midlevel officials who also caught the prime minister off-guard. Nevertheless, he personally apologized to the vice president.

Mr. Netanyahu’s only premeditated misstep was his speech to Congress, which I recommended against. Even that decision, though, came in reaction to a calculated mistake by President Obama. From the moment he entered office, Mr. Obama promoted an agenda of championing the Palestinian cause and achieving a nuclear accord with Iran. Such policies would have put him at odds with any Israeli leader. But Mr. Obama posed an even more fundamental challenge by abandoning the two core principles of Israel’s alliance with America...

‘Nobody has a monopoly on making mistakes.” When I was Israel’s ambassador to the United States from 2009 to the end of 2013, that was my standard response to reporters asking who bore the greatest responsibility—President Barack Obama or Prime Minister Benjamin Netanyahu—for the crisis in U.S.-Israel relations.

I never felt like I was lying when I said it. But, in truth, while neither leader monopolized mistakes, only one leader made them deliberately.

Israel blundered in how it announced the expansion of Jewish neighborhoods and communities in Jerusalem over the border lines that existed before the Six Day War in 1967. On two occasions, the news came out during Mr. Netanyahu’s meetings with Vice President Joe Biden. A solid friend of Israel, Mr. Biden understandably took offense. Even when the White House stood by Israel, blocking hostile resolutions in the United Nations, settlement expansion often continued.

In a May 2012 Oval Office meeting, Mr. Netanyahu purportedly “lectured” Obama about the peace process. Later that year, he was reported to be backing Republican contender Mitt Romney in the presidential elections. This spring, the prime minister criticized Mr. Obama’s Iran policy before a joint meeting of Congress that was arranged without even informing the president.

Yet many of Israel’s bungles were not committed by Mr. Netanyahu personally. In both episodes with Mr. Biden, for example, the announcements were issued by midlevel officials who also caught the prime minister off-guard. Nevertheless, he personally apologized to the vice president.

Mr. Netanyahu’s only premeditated misstep was his speech to Congress, which I recommended against. Even that decision, though, came in reaction to a calculated mistake by President Obama. From the moment he entered office, Mr. Obama promoted an agenda of championing the Palestinian cause and achieving a nuclear accord with Iran. Such policies would have put him at odds with any Israeli leader. But Mr. Obama posed an even more fundamental challenge by abandoning the two core principles of Israel’s alliance with America...